The first machining center was successfully developed in 1958 by the American company Kearney & Trecker. Based on a CNC horizontal boring and milling machine, it incorporated an automatic tool changer, enabling the centralized processing of multiple operations—such as milling, drilling, boring, reaming, and tapping—after a single workpiece setup. A machining center is a highly automated, multifunctional CNC machine tool equipped with a tool magazine and an automatic tool-changing mechanism. After a workpiece is clamped on a machining center, it can undergo multiple operations on two or more surfaces, with various tool-changing or tool-selecting functions, significantly improving production efficiency.